watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2026-02-02T18:44:09Z. The update package is 547.67 MB. This is a delta (partial) update that requires 6.1.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 9a61e8ae85c160ef49d338e49622e9939fd4a0bf.zip.